Swedish 25 and 50 ore coins were minted in silver from 1910 to 1941. About halfway between these dates, in 1920, the same denominations with different patterns were minted in nickel-bronze. Of course the coins minted from precious metal are more valuable than those minted in non-precious metal.

For the silver coins 1910 to 1941:

25 ORE: 0.047 troy ounces silver
50 ORE: 0.096 troy ounces silver

Silver coins must always be worth at least their silver value. If silver were trading at, say, $20 US dollars per troy ounce, the Base Value (BV) of a 50 ore coin would be 0.096 x 20 = $2. Look up the price of silver. It changes every day.

In addition to base silver value, collectors will pay premiums to add nice-looking coins to their collections.